Hi marvin,
Which splitclick and splitbutton you are testing? It is a part of the Rich TextEditor? Or is your custom function?
Do you get the same problem on http://richtexteditor.com/demo/? If yes, please show me the full steps to reproduce this issue, so we can check it.
By the way, if the online demo works for you, I suggest you download the latest build and try agian.
latest build download url: http://richtexteditor.com/download/richtexteditor.rar
Regards,
Ken